How do I tag a database component in UML?

Question

In an UML component diagram, how does one tag or identify a component as a database, so that it's easily recognizable? In the old days there was the cylinder symbol for showing database but that's not part of the UML. Same goes for an application server for instance, how would that be shown?

Are stereotypes applicable here? Can the component symbol be enhanced with graphical elements?

Solution 1

UML can be extended through profiles.

The key extensibility mechanisms are sterotypes, constraints, and tagged values.

Sterotypes can have an optional stereotype icon.

• You may be able to find an existing profile with a cylindrical icon for «database»
• Your UML tool may allow you to create your own profile

Solution 2

Just use the <<database>> for the component diagram.

For a more detailed information check out this article: http://www.sparxsystems.com.au/resources/uml_datamodel.html

Solution 3

You tag databases <<database>> and servers as (it appears) <<infrastructure>> according to Scott Ambler. I pulled this information from Figure 1, but I would recommend reading this article (and his other articles - they are good reads).

Something else I want to point out - UML is just one method of modeling. In formal documentation, I try to adhere to the standard. However, when planning and documenting for the team, I use whatever makes sense and is understood by the team. For you, that might mean putting a cylinder labeled "DB" or the name of the DB in the component box.

Comments

[a1an]

That makes me wonder why we got UML in the first place if it now takes the road to go back to different profiles for different models -.- I'll go for the <<database>> anyways.